<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>label</title>
</head>

<body>
  <label for="text">用户名：</label> <input type="text" id="text" value="请输入用户名"> <br>
  <label for="nan">男</label> <input type="radio" name="sex" id="nan" checked="checked">
  <label for="nv">女</label> <input type="radio" name="sex" id="nv">
</body>

</html>